Changeable exhibitor for cards, pictures, signs, and the like.



H. I. TROXELL. 'CHANGEABLE EXHIBITOR FOH mans, PICTURES, SIGNS, AND THE LIKE.

APPLICATION FILED AUG.20. I917.

1,254,746. Patented Jan. 29,1918.

2 SHEETS-SHEET 1- H. 1. TROXELL CHANGEABLE EXHIBITOR FOR CARDS, PICTU SIGNS, AND THE LIKE. APPLICATION FILED Aue.20. 19w.

Patented Jan. 29,1918.

2 SHEETS-SHEET 2.

\ v ayvuawtoz 6] Roz a;

44.- or said rod may be moved in its bracket 45 and secured in adjusted position by set screws 46 and 47, respectively, as shown, to

enlarge or diminish theimage thrown upon the screen. v

The operation of the device is as followse-Tho pockets 18 of the disk 17 are filled with slides containing; advertising matter, views, etc., and thedevices 21 ingroove 24 until it runs out at the end 48 of the groove. At the same time that this pin is leaving thegroove 24 the next pin Wlll be entering it at 49, thereby rotating shaft 14 and with it disk 17 to move a new. slide to osition between the lenses 13 and 43. But

efore the pin 23 leaves groove 24, earn 42 operates on lever 40 to move shutter 38 into position-over the opening 50 of the lens 13, thus cuttin oil the light, and the shutter is heldin t is positionfby the cam .42 and lever 40 until disk 17 has rotated to'brin'ga new slide into position. Then the shutter drops down and the Image of the view or' advertlsing. matter 1s pro ected upon screen.

6. If desired, a spring or other devi e may be applied to the level-4Q or to the shutter 38 to supplementgravity in'the descent of the shutter.

This operation maybe continued without the attention of an operator, until it is desired to substitute a new set of Slides for those then in the .diskoor the power cut-61f. If. desired, the rotation of disk 17 may be made so-slow as*- to allow of a change of slides without interferingwith the opera- 'tion of the machine.

Various changes in details of construction and arrangement of parts are permissible within the spirit of the invention and the sco e of the claims. following.

I atIclaim is:-- 1. In a changeable exhibitor, a; casing provided with ascreen' at one end thereof, a

' projecting apparatus at the'otherend thereof, a rotatable disk provided with a plurality of slides interposed in said PIOJGCtiIlg apparatus, a pin-wheel mounted to turn with saiddisk, and a grooved cam cooperating with said pin-wheel for imparting intermittent rotary motion thereto and to said disk.

2; In a changeable exhibitor, a light-proof casing provided 'with a-s'creen, a condensing lens, a projecting lens, a rotatable slide-car- 'rlerinterposed between said lenses, a source of light for said lenses whereby the views on said slides are projected upon the screen, a constantly actuated ooved cam coactlng with. a pin-wheel for lmparting intermittent rotation to' said slide carrieryand a shutter operable during the rotation of said slide carrier for obstructing the passage of light. 3. In a changeable exhibitor, a Screen, a

projecting'apparatus, a rotatable slide car-- rylng disk interposed in said projecting aparatus, a cam and pin-wheel mechanism for lmpartlng intermittent rotary Inot1on to .said disk, constantly actuated transmission 'mechamsm connected with sand cam for 1mparting constant rotary motion thereto, a source of light for said projecting apparatus, a shutter slidably mounted between said source of light and said disk, and means operated by sald cam for interposing said shutter between said light and disk when said disk rotates. V v

4. In a changeable exhibitor, a projecting apparatus comprising a stationary condensing lens, an adjustable projecting lens and an intermittently-rotated slide-carrying disk interposed between said lenses, a number of slide-holders-arranged radially of said disk and adapted by rotation :to be brought into focus between saidlenses, a shaft on which said-disk is mounted, a pin-wheel-on said A shaft having pins of a number to correspond with the number of slides of said disk, a camadapted to engage said pins to impart step-by-step rotation to said disk whereby at each step a slide is, brought into focus between said lenses, a shutter mounted to slide between said condensing lens and-disk during the rotation of'the. disk, a cam and lever mechanism so timed as to impart mo- -tion-to said shutter in proper relation to .the

rotation of said disk, and means for sup- 1 plying power to said moving parts.

n testlmony whereof I have hereunto set my hand this 17th day of August A. D. 1917.

' HARRY J. TROXELL. Witnesses: 1

Means,

' Non'ron G. 'MILnEn, 

